https://padlet.com/tom_huang/cwbmek960dnf Made with the best of intentions en-us 2017-11-01 02:18:24 UTC 2017-11-01 02:54:21 UTC hello@padlet.com https://padletuploads.blob.core.windows.net/prod/232480560/565d8f45fdcdc26f0f15d26fcaed2871/___.jpg tom_huang https://padlet.com/tom_huang/cwbmek960dnf/wish/202368327 2017-11-01 02:30:02 UTC https://padlet.com/tom_huang/cwbmek960dnf/wish/202368327 tom_huang https://padlet.com/tom_huang/cwbmek960dnf/wish/202369030 Because some people Interest in space and want explore space so they invention the rocket to go to space explore space's everything and those people is called astronaut.]]> 2017-11-01 02:36:35 UTC https://padlet.com/tom_huang/cwbmek960dnf/wish/202369030 tom_huang https://padlet.com/tom_huang/cwbmek960dnf/wish/202370304 High silica glass fiber reinforced phenolic resin,Graphite materials with high strain properties,Carbon fiber fabric,Quartz fiber reinforced silica,High strength aluminum alloy made of semi-hard shell structure or honeycomb structure,magnesium ,tungsten, molybdenum,Glass fiber reinforced silicone rubber]]> 2017-11-01 02:45:48 UTC https://padlet.com/tom_huang/cwbmek960dnf/wish/202370304 tom_huang https://padlet.com/tom_huang/cwbmek960dnf/wish/202370591 At the beginning of the twentieth century, the scientific investigation of interstellar travel became commonplace, which was largely inspired by the magical imagination of the fictional writers such as Verne and Wales. The scientific community in the rocket technology development so that this goal gradually become a reality.
In 1903, high school math teacher Joel Kovsky published "the use of reaction facilities to explore the universe", which is the first use of rockets for space travel rigorous papers. The rocket propulsion formula was named after his name, and he first proposed the use of liquid hydrogen and liquid oxygen as rocket propellants and calculated the maximum exhaust speed of such rockets. His work was obscure outside the Soviet Union, but in the Soviet Union his work laid the foundations for the subsequent research experiments and contributed to the establishment of the Society for Studies of Interplanetary Travel in 1924.
In 1912, Robert Esnault-Pelterie published a lecture on rocket theory and interstellar travel. He independently deduced the Ziokovsky rocket propulsion formula, calculated the basic energy required to travel to and from the planet, and proposed the use of atomic energy (eg, radium) for rocket propulsion.
In 1912, Robert Goddard, inspired by the early work of Wales, began a series of rocket studies, including solid fuel rockets that needed to be improved in three ways. First, the fuel should be burned in a small combustion chamber rather than building a whole propellant container to withstand high pressure; then, the rocket can be divided into multiple stages; finally, the use of Laval nozzle (De Laval nozzle) can make the exhaust The speed exceeded the speed of sound, and he applied for a patent in 1914 for these discoveries. He also independently developed the rocket flight mathematical theory.

]]> 2017-11-01 02:47:19 UTC https://padlet.com/tom_huang/cwbmek960dnf/wish/202370591 tom_huang https://padlet.com/tom_huang/cwbmek960dnf/wish/202371087 https://zh.wikipedia.org/wiki/%E7%81%AB%E7%AE%AD#.E8.B5.B7.E6.BA.90]]> 2017-11-01 02:51:03 UTC https://padlet.com/tom_huang/cwbmek960dnf/wish/202371087